Special double-layer carbon-free tundish covering agent for silicon steel and use method thereof

The technology of covering agent and tundish is applied in the field of metal smelting auxiliary materials, which can solve the problems such as carbon increase in continuous casting of silicon steel, and achieve the effects of strong assimilation and adsorption of inclusions, small loss on ignition and simple process.

Active Publication Date: 2011-04-06
XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These covering agents are usually developed with good thermal insulation properties, prevention of secondary oxidation of molten steel, adsorption of inclusions, etc., and the pH of the covering agents is more alkaline, and the alkalinity of some covering agents is even greater than 6.0. It can be seen that the covering agents developed by these patents It is mainly for pure steel, except for the patent with the publication number CN101633034A, which does not involve silicon steel smelting; although CN101633034A involves silicon steel smelting, it focuses on solving the problem of controlling the fluctuation of acid-soluble aluminum in molten steel, and does not involve solving the problem of increasing silicon steel continuous casting. Carbon and Nitrogen Issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A double-layer carbon-free tundish covering agent for silicon steel, comprising an upper covering agent and a lower covering agent, wherein the chemical composition and weight percentage of the upper covering agent are: SiO 2 40%, MgO14%, CaO0.8%, Fe 2 o 3 18%, Al 2 o 3 13%, S0.001%, P0.0005%, the rest is lost on ignition; the chemical composition and weight percentage of the lower layer covering agent are: SiO 2 53%, MgO2%, CaO42%, Fe 2 o 3 0.8%, Al 2 o 3 2%, S0.001%, P0.0008%, and the balance is loss on ignition.

[0017] The method of use is as follows:

[0018] a. Add lower layer covering agent: after pouring, when the molten steel level of the tundish rises to a quarter of the tundish capacity, add about 30-50 kg of lower layer covering agent to the side hole near the stopper rod, measure the temperature and take samples from the side hole Add about 40-60kg of lower layer covering agent. When the lower nozzle of the shroud is submerged in molten steel and ...

Embodiment 2

[0021] A double-layer carbon-free tundish covering agent for silicon steel, comprising an upper covering agent and a lower covering agent, wherein the chemical composition and weight percentage of the upper covering agent are: SiO 2 38%, MgO22%, CaO1%, Fe 2 o 3 10%, Al 2 o 3 13%, S0.0005%, P0.001%, the rest is lost on ignition; the chemical composition and weight percentage of the lower layer covering agent are: SiO 2 47%, MgO1%, CaO38%, Fe 2 o 3 0.6%, Al 2 o 3 1%, S0.0004%, P≤0.0005%, and the balance is loss on ignition.

[0022] The method of use is as in Example 1.

Embodiment 3

[0024] A double-layer carbon-free tundish covering agent for silicon steel, comprising an upper covering agent and a lower covering agent, wherein the chemical composition and weight percentage of the upper covering agent are: SiO 2 41%, MgO18%, CaO0.6%, Fe 2 o 3 14%, Al 2 o 3 15%, S0.0007%, P0.0006%, the remainder is loss on ignition; the chemical composition and weight percentage of the lower layer covering agent are: SiO 2 50%, MgO2.5%, CaO41%, Fe 2 o 3 0.6%, Al 2 o 3 1%, S≤0.0006%, P0.0006%, and the balance is loss on ignition.

[0025] The method of use is as in Example 1.

[0026] In embodiment one, embodiment two, embodiment three, the variation of molten steel carbon content in ladle, tundish is as follows:

[0027]

Ladle, C%

Tundish, C%

Carbon increase / PPM

Embodiment one

0.0013

0.002

7

Embodiment two

0.0016

0.0018

2

Embodiment Three

0.0011

0.0016

5

[0028] In embod...

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PUM

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Abstract

The invention discloses a special double-layer carbon-free tundish covering agent for silicon steel and a use method thereof. The production process of the special double-layer carbon-free tundish covering agent for the silicon steel is simpler and more convenient, and a production process of an the upper layer of covering agent comprises the following steps of: crushing a mixture prepared from all component with qualified chemical components; grinding the mixture to fine granules with the granularity of 0-0.21 mm; uniformly stirring and drying until the water content is less than 0.5 percent; and packaging. A production process of a lower layer of covering agent comprises the following steps of: crushing a mixture prepared from all component with qualified chemical components; grinding the mixture to fine granules with the granularity of 0-0.15mm; uniformly stirring and drying until the water content is less than 0.5 percent; and packaging. The special double-layer carbon-free tundish covering agent for the silicon steel with good fusion performance and spreadability produced by the invention can ensure that the fluctuation of the components C, N, S, P and Al of the molten steel in the tundish is within 10PPm (the fluctuation of the casting in 5PPM is up to more than 80 percent) during the smelting process of the silicon steel, thereby ensuring the smooth operation of continuous casting process.

Description

technical field [0001] The invention belongs to the technical field of metal smelting auxiliary materials, in particular to a special double-layer carbon-free tundish covering agent for silicon steel and a use method thereof. technical background [0002] The production process and equipment of silicon steel are complex, the components of the steel are strictly controlled, the impurity content is extremely low, the manufacturing process is longer than that of carbon steel, the factors affecting performance are more than those of carbon steel, and the control range of each component is narrower than that of carbon steel. "Craftsmanship" in steel. [0003] Carbon is a harmful element in silicon steel. Preventing the covering agent (or thermal insulation agent, the same below) used in the tundish from adding carbon to the slab during casting is one of the important links in continuous casting of silicon steel. For the development of silicon steel special tundish covering agent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
Inventor 张洪战汪国敏赵博屈党军王岩
Owner XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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